Solve this following


If the curves $\mathrm{y}^{2}=6 \mathrm{x}, 9 \mathrm{x}^{2}+\mathrm{by}^{2}=16$ intersect each other at right angles, then the value of $b$ is :

  1. $\frac{7}{2}$

  2. 4

  3. $\frac{9}{2}$

  4. 6

Correct Option: , 3


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